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TECHNICAL DATA Orban Model 8400
I/O input/output
ITU International Telecommunications Union (formerly CCIR). ITU-R is the arm of the ITU dedi-
cated to radio.
JFET junction field effect transistor
LC inductor/capacitor
LCD liquid crystal display
LED light-emitting diode
LF low-frequency
LP low-pass
LVL level
MHF midrange/high-frequency
MLF midrange/low-frequency
MOD modulation
N&D noise and distortion
N/C no connection
OSHOOT overshoot
PC IBM-compatible personal computer
PCM pulse code modulation
PPM peak program meter
RAM random-access memory
RC resistor/capacitor
RDS/RBDS Radio (Broadcasting) Data Service—a narrowband digital subcarrier centered at 57 kHz in
the FM baseband that usually provides program or network-related data to the consumer in
the form of text that is displayed on the radio. Occupied bandwidth is ±2500 Hz.
REF reference
RF radio frequency
RFI radio-frequency interference
RMS root-mean-square
ROM read-only memory
SC subcarrier
SCA
subsidiary communications authorization ⎯ a non program-related subcarrier in the FM
baseband above 23 kHz (monophonic) or 57 kHz (stereophonic)
S/P-DIF Sony/Philips digital interface
TRS tip-ring-sleeve (2-circuit phone jack)
THD total harmonic distortion
TX transmitter
μs Microseconds. For FM pre-emphasis, the +3 dB frequency is 1/(2 π τ), where τ is the pre-
emphasis time constant, measured in seconds.
VCA voltage-controlled amplifier
VU volume unit (meter)
XLR a common style of 3-conductor audio connector
XTAL crystal
Parts List
Many parts used in the 8400 are surface-mount devices (“SMT”) and are not intended for
field replacement because specialized equipment and skills are necessary to remove and
replace them. The list below includes many of the parts used in the 8400 (including sur-
face-mount devices), but inclusion of a part in this list does not imply that the part is
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